This is a difficult one to answer as there are so many different types of cancer of which quite a few have almost no warning signs. Growths or tumours are often early warning signs and should be checked out immediately, as time is of the essence. Internal tumours can cause a wide variety of symptoms, including exhaustion and localized pain. An unexplained change in how your body functions could also be a warning sign. Have it checked out as a false alarm is always preferable to traumatic and invasive intervention.
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